# CEL expression in CFX pre

 Register Blogs Members List Search Today's Posts Mark Forums Read

 May 31, 2016, 08:36 CEL expression in CFX pre #1 New Member   meizhenwang Join Date: Jul 2015 Posts: 5 Rep Power: 10 Hi, I am defining an expression of radial velocity under the cylindrical coordinate system in CFX pre. The expression is 0.3[m s^-1]*(y/(0.025[m]))^(1/7) .But when I run the CFX solver ,there is a error： PROBLEM ENCOUNTERED WHEN EXECUTING CFX EXPRESSION LANGUAGE | | | | The CFX expression language was evaluating: | | Velocity r Component | | | | The problem was: | | INVALID-EXPONENTIATION | | | | FURTHER INFORMATION | | | | The problem was encountered in executing the expression for: | | E1 | | The complete expression is: | | 0.3[m s^-1]*(y/(0.025[m]))^(1/7) | | The error occurs on sub-expression: | | (y/(0.025[m]))^(1/7) | | | | BACKGROUND INFORMATION | | | | The error was detected at one location. The same problem may be | | present at other locations - that has not been investigated. | | The following values are for the first location which has the | | problem. | | | | In this expression, these sub-expressions have been calculated: | | | | Sub-expression = Value | | | | 0.3[m s^-1] = 0.300000 | | These values were set before reaching the current expression: | | | | Name = Expression = Value | | | | y = \$LOCAL_y = -1.387779E-17 |

 June 3, 2016, 02:48 #2 Senior Member   david Join Date: Oct 2012 Posts: 142 Rep Power: 13 instead of using just "y", use "y+0.0001[m]".